1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
|
// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2020-2021, The Linux Foundation. All rights reserved.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/elf.h>
#include <linux/wait.h>
#include <linux/cdev.h>
#include <linux/atomic.h>
#ifdef CONFIG_CNSS_OUT_OF_TREE
#include "qcom_ramdump.h"
#else
#include <soc/qcom/qcom_ramdump.h>
#endif
#include <linux/devcoredump.h>
#include <linux/of.h>
#include <linux/io.h>
#include <linux/devcoredump.h>
#if !IS_ENABLED(CONFIG_WCN_GOOGLE)
#include <linux/soc/qcom/mdt_loader.h>
#endif
#define SIZEOF_ELF_STRUCT(__xhdr) \
static inline size_t sizeof_elf_##__xhdr(unsigned char class) \
{ \
if (class == ELFCLASS32) \
return sizeof(struct elf32_##__xhdr); \
else \
return sizeof(struct elf64_##__xhdr); \
}
SIZEOF_ELF_STRUCT(phdr)
SIZEOF_ELF_STRUCT(hdr)
#define set_xhdr_property(__xhdr, arg, class, member, value) \
do { \
if (class == ELFCLASS32) \
((struct elf32_##__xhdr *)arg)->member = value; \
else \
((struct elf64_##__xhdr *)arg)->member = value; \
} while (0)
#define set_ehdr_property(arg, class, member, value) \
set_xhdr_property(hdr, arg, class, member, value)
#define set_phdr_property(arg, class, member, value) \
set_xhdr_property(phdr, arg, class, member, value)
struct qcom_ramdump_desc {
void *data;
struct completion dump_done;
};
static int enable_dump_collection;
module_param(enable_dump_collection, int, 0644);
bool dump_enabled(void)
{
return enable_dump_collection;
}
EXPORT_SYMBOL(dump_enabled);
#if !IS_ENABLED(CONFIG_WCN_GOOGLE)
static ssize_t qcom_devcd_readv(char *buffer, loff_t offset, size_t count,
void *data, size_t datalen)
{
struct qcom_ramdump_desc *desc = data;
return memory_read_from_buffer(buffer, count, &offset, desc->data, datalen);
}
static void qcom_devcd_freev(void *data)
{
struct qcom_ramdump_desc *desc = data;
vfree(desc->data);
complete_all(&desc->dump_done);
}
static int qcom_devcd_dump(struct device *dev, void *data, size_t datalen, gfp_t gfp)
{
struct qcom_ramdump_desc desc;
desc.data = data;
init_completion(&desc.dump_done);
dev_coredumpm(dev, NULL, &desc, datalen, gfp, qcom_devcd_readv, qcom_devcd_freev);
wait_for_completion(&desc.dump_done);
return !completion_done(&desc.dump_done);
}
#else
static int qcom_devcd_dump(struct device *dev, void *data, size_t datalen, gfp_t gfp)
{
vfree(data);
return 0;
}
#endif
int qcom_dump(struct list_head *segs, struct device *dev)
{
struct qcom_dump_segment *segment;
void *data;
void __iomem *ptr;
size_t data_size = 0;
size_t offset = 0;
if (!segs || list_empty(segs))
return -EINVAL;
list_for_each_entry(segment, segs, node) {
pr_info("Got segment size %lu\n", segment->size);
data_size += segment->size;
}
data = vmalloc(data_size);
if (!data)
return -ENOMEM;
list_for_each_entry(segment, segs, node) {
if (segment->va)
memcpy(data + offset, segment->va, segment->size);
else {
ptr = devm_ioremap(dev, segment->da, segment->size);
if (!ptr) {
dev_err(dev,
"invalid coredump segment (%pad, %zu)\n",
&segment->da, segment->size);
memset(data + offset, 0xff, segment->size);
} else
memcpy_fromio(data + offset, ptr,
segment->size);
}
offset += segment->size;
}
return qcom_devcd_dump(dev, data, data_size, GFP_KERNEL);
}
EXPORT_SYMBOL(qcom_dump);
/* Since the elf32 and elf64 identification is identical
* apart from the class we use elf32 by default.
*/
static void init_elf_identification(struct elf32_hdr *ehdr, unsigned char class)
{
memcpy(ehdr->e_ident, ELFMAG, SELFMAG);
ehdr->e_ident[EI_CLASS] = class;
ehdr->e_ident[EI_DATA] = ELFDATA2LSB;
ehdr->e_ident[EI_VERSION] = EV_CURRENT;
ehdr->e_ident[EI_OSABI] = ELFOSABI_NONE;
}
int qcom_elf_dump(struct list_head *segs, struct device *dev, unsigned char class)
{
struct qcom_dump_segment *segment;
void *phdr;
void *ehdr;
size_t data_size;
size_t offset;
int phnum = 0;
void *data;
void __iomem *ptr;
if (!segs || list_empty(segs))
return -EINVAL;
data_size = sizeof_elf_hdr(class);
list_for_each_entry(segment, segs, node) {
data_size += sizeof_elf_phdr(class) + segment->size;
phnum++;
}
data = vmalloc(data_size);
if (!data)
return -ENOMEM;
pr_debug("Creating elf with size %lu\n", data_size);
ehdr = data;
memset(ehdr, 0, sizeof_elf_hdr(class));
init_elf_identification(ehdr, class);
set_ehdr_property(ehdr, class, e_type, ET_CORE);
set_ehdr_property(ehdr, class, e_machine, EM_NONE);
set_ehdr_property(ehdr, class, e_version, EV_CURRENT);
set_ehdr_property(ehdr, class, e_phoff, sizeof_elf_hdr(class));
set_ehdr_property(ehdr, class, e_ehsize, sizeof_elf_hdr(class));
set_ehdr_property(ehdr, class, e_phentsize, sizeof_elf_phdr(class));
set_ehdr_property(ehdr, class, e_phnum, phnum);
phdr = data + sizeof_elf_hdr(class);
offset = sizeof_elf_hdr(class) + sizeof_elf_phdr(class) * phnum;
list_for_each_entry(segment, segs, node) {
memset(phdr, 0, sizeof_elf_phdr(class));
set_phdr_property(phdr, class, p_type, PT_LOAD);
set_phdr_property(phdr, class, p_offset, offset);
set_phdr_property(phdr, class, p_vaddr, segment->da);
set_phdr_property(phdr, class, p_paddr, segment->da);
set_phdr_property(phdr, class, p_filesz, segment->size);
set_phdr_property(phdr, class, p_memsz, segment->size);
set_phdr_property(phdr, class, p_flags, PF_R | PF_W | PF_X);
set_phdr_property(phdr, class, p_align, 0);
if (segment->va)
memcpy(data + offset, segment->va, segment->size);
else {
ptr = devm_ioremap(dev, segment->da, segment->size);
if (!ptr) {
dev_err(dev,
"invalid coredump segment (%pad, %zu)\n",
&segment->da, segment->size);
memset(data + offset, 0xff, segment->size);
} else
memcpy_fromio(data + offset, ptr,
segment->size);
}
offset += segment->size;
phdr += sizeof_elf_phdr(class);
}
#if IS_ENABLED(CONFIG_WCN_GOOGLE)
/* SSCD integration */
sscd_set_coredump(data, data_size);
#endif
return qcom_devcd_dump(dev, data, data_size, GFP_KERNEL);
}
EXPORT_SYMBOL(qcom_elf_dump);
#if !IS_ENABLED(CONFIG_WCN_GOOGLE)
int qcom_fw_elf_dump(struct firmware *fw, struct device *dev)
{
const struct elf32_phdr *phdrs, *phdr;
const struct elf32_hdr *ehdr;
struct qcom_dump_segment *segment;
struct list_head head;
int i;
ehdr = (struct elf32_hdr *)fw->data;
phdrs = (struct elf32_phdr *)(ehdr + 1);
INIT_LIST_HEAD(&head);
for (i = 0; i < ehdr->e_phnum; i++) {
phdr = &phdrs[i];
if (phdr->p_type != PT_LOAD)
continue;
if ((phdr->p_flags & QCOM_MDT_TYPE_MASK) == QCOM_MDT_TYPE_HASH)
continue;
if (!phdr->p_memsz)
continue;
segment = kzalloc(sizeof(*segment), GFP_KERNEL);
if (!segment)
return -ENOMEM;
segment->da = phdr->p_paddr;
segment->size = phdr->p_memsz;
list_add_tail(&segment->node, &head);
}
qcom_elf_dump(&head, dev, ELFCLASS32);
return 0;
}
EXPORT_SYMBOL(qcom_fw_elf_dump);
#endif
MODULE_DESCRIPTION("Qualcomm Technologies, Inc. Ramdump driver");
MODULE_LICENSE("GPL v2");
|
